| Challenger - Ismaning | 10/24 12:35 | 26 | [431] Johannes Haerteis v Tristan Lamasine [272] | 6-4,6-4 | |
| ITF - M25 Hamburgo | 10/23 10:00 | 28 | Henri Squire v Johannes Haerteis | 6-4,6-4 | |
| ITF - M25 Hamburgo | 10/22 12:10 | 27 | Johannes Haerteis v Daniel Little | 6-4,6-4 | |
| ITF - M25 Hamburgo | 10/21 15:45 | 26 | Johannes Haerteis v Leonard Von Hindte | 6-3,6-4 | |
| ITF - M25 Hamburgo | 10/20 10:50 | 25 | Johannes Haerteis v Riccardo Balzerani | 6-3,6-4 | |
| ITF - M25 Jönköping | 09/20 10:45 | 25 | [397] Filip Bergevi v Johannes Haerteis [363] | 6-4,7-6 | |
| ITF - M25 Plaisir | 09/15 11:45 | 25 | Johannes Haerteis v Leny Mitjana | 4-6,6-7 | |
| Challenger - Tulln | 09/06 13:00 | 25 | [367] Johannes Haerteis v Filip Horansky [195] | 6-4,4-6,3-6 | |
| Challenger - Maiorca | 09/01 18:40 | 25 | [367] Johannes Haerteis v Lukas Lacko [197] | 2-6,3-6 | |
| Challenger - Maiorca | 08/31 08:00 | 19 | [349] Nicolas Moreno De Alboran v Johannes Haerteis [367] | 3-6,6-4,4-6 | |
| Challenger - Maiorca | 08/30 08:00 | 14 | [167] Sergio Martos Gornes v Johannes Haerteis [367] | 1-6,1-6 | |
| Challenger - Praga | 08/24 10:15 | 25 | [361] Johannes Haerteis v Alex Rybakov [411] | 4-6,2-6 | |
| Challenger - Lüedenscheid | 08/15 09:30 | 14 | Bogdan Bobrov v Johannes Haerteis | 1-6,6-4,6-3 | |
| Challenger - Meerbusch | 08/08 16:05 | 14 | Ivan Nedelko v Johannes Haerteis | 7-6,6-3 | |
| Challenger - Segóvia | 07/27 13:05 | 25 | [172] Altug Celikbilek v Johannes Haerteis [339] | 6-3,6-4 | |
| Challenger - Pozoblanco | 07/20 20:10 | 25 | [209] Cem Ilkel v Johannes Haerteis [334] | 6-2,7-6 | |
| Challenger - Amersfoort | 07/13 08:30 | 25 | [225] Mats Moraing v Johannes Haerteis [332] | 6-1,6-0 | |
| Challenger - Brunsvique | 07/04 11:55 | 14 | Johannes Haerteis v Nino Ehrenschneider | 6-3,3-6,4-6 | |
| Challenger - Prostejov | 06/15 08:30 | 25 | [330] Johannes Haerteis v Federico Coria [103] | 1-6,0-6 | |
| Challenger - Prostejov | 06/14 08:30 | 19 | [330] Johannes Haerteis v David Poljak [461] | 5-7,3-6 | |
| Challenger - Prostejov | 06/13 09:00 | 14 | Johannes Haerteis v Jakub Nicod | 6-3,3-6,6-3 | |
| Challenger - Bratislava | 06/06 14:15 | 14 | [384] Skander Mansouri v Johannes Haerteis [330] | 6-3,7-5 | |
| Challenger - Oeiras | 05/25 14:00 | 25 | [328] Johannes Haerteis v Filip C Jianu [349] | 3-6,0-6 | |
| ATP - Delray Beach | 01/05 15:00 | 164 | [374] Stefan Kozlov v Johannes Haerteis [305] | Retired | |
| Challenger - Ortisei | 11/19 10:00 | 26 | [311] Johannes Haerteis v Ilya Ivashka [113] | 6-7,3-6 | |
| Challenger - Ortisei | 11/17 09:00 | 25 | [240] Daniel Masur v Johannes Haerteis [310] | 3-6,7-6,3-6 | |
| Challenger - Ortisei | 11/15 10:00 | 19 | [247] Alexey Vatutin v Johannes Haerteis [310] | 3-6,6-3,3-6 | |
| Challenger - Ortisei | 11/14 09:00 | 64 | [310] Johannes Haerteis v Viktor Galovic [282] | 4-6,7-6,6-4 | |
| Challenger - Bratislava | 11/08 11:00 | - | [329] Johannes Haerteis v Julian Lenz [258] | 7-6,4-6,6-7 | |
| Challenger - Bratislava | 11/07 15:35 | 64 | [207] Maxime Janvier v Johannes Haerteis [329] | Retired |